Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Additional Information (Detail)

v3.7.0.1
Property and Equipment - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 389 $ 550 $ 495